Finding the order of a particular entry in a query result

Question

suppose i ve the output of a select query as
emp_id emp_name
101 one
109 nine
112 twelve
120 twenty
from this how can i know the rank of a particular emp_id. For eg: for 112 i must get it as 3, and for 109 i must get 2.Can any one help???????
thanking you in anicipation.

Answer 1

drop table t purge
create table t
(emp_id number(3),
emp_name varchar2(10))
insert into t values(101,'one');
insert into t values('109','nine');
insert into t values('112','twelve');
insert into t values('120','twenty');
insert into t values('113','thirteen');
select *
from t;
EMP_ID EMP_NAME
101 one
109 nine
112 twelve
120 twenty
113 thirteen
5 rows selected
select row_number()over(order by emp_id)rnk,emp_id,emp_name
from t;
RNK EMP_ID EMP_NAME
1 101 one
2 109 nine
3 112 twelve
4 113 thirteen
5 120 twenty
5 rows selected